本文实例为大家分享了java文件上传下载的具体代码，供大家参考，具体内容如下
文件上传
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@requestmapping (value= "/uploadfile" ,method=requestmethod.post) public resultobject uploadfiles( @requestparam ( "file" )multipartfile file,httpservletrequest request){ resultobject rs = null ; //返回上传完成信息 string uploaddir = "files" ; //上传目录,文件保存在webapp下的files文件中 if (!file.isempty()) { //可以对user做一些操作如存入数据库 //以下的代码是将文件file重新命名并存入tomcat的webapp目录下项目的下级目录 string filerealname = file.getoriginalfilename(); //获得原始文件名; /*int pointindex = filerealname.indexof("."); //点号的位置 string filesuffix = filerealname.substring(pointindex); //截取文件后缀 uuid fileid = uuid.randomuuid(); //生成文件的前缀包含连字符 string savedfilename = fileid.tostring().replace("-", "").concat(filesuffix); //文件存取名 */
string saveddir = request.getsession().getservletcontext().getrealpath(uploaddir); //获取服务器指定文件存取路径 file savedfile = new file(saveddir, filerealname); boolean iscreatesuccess; try { iscreatesuccess = savedfile.createnewfile(); if (iscreatesuccess) {
file.transferto(savedfile); //转存文件 rs = resultobject.getsuccessresult( "上传文件成功" ); long size = file.getsize(); //获取文件大小
rs.setdata(uploaddir+filerealname); } else { rs = resultobject.getfailresult( "请修改文件名,重新上传" ); } } catch (ioexception e) { e.printstacktrace(); } } else { rs = resultobject.getfailresult( "文件不能为空" ); } return rs; } |
文件下载
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@requestmapping (value = "/filterpermission/appdownload" , method = requestmethod.get) public void appdownload(httpservletrequest request, httpservletresponse response) { //url是上面文件上传的url download(url,request,response); } |
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public string download(string filepath, httpservletrequest request, httpservletresponse response) { bufferedinputstream bis = null ; bufferedoutputstream bos = null ; try { //获取文件名 string filename = filepath.substring(filepath.lastindexof( "/" )+ 1 ); response.setcharacterencoding( "utf-8" ); response.setcontenttype( "application/octet-stream" ); //response.setcontenttype("application/force-download"); //处理下载弹出框名字的编码问题 response.setheader( "content-disposition" , "attachment;filename=" + new string( filename.getbytes( "gb2312" ), "iso8859-1" )); //获取文件的下载路径 string path = request.getsession().getservletcontext().getrealpath(filepath); //利用输入输出流对文件进行下载 inputstream inputstream = new fileinputstream( new file(path)); //设置文件大小 response.setheader( "content-length" , string.valueof(inputstream.available()));
bis = new bufferedinputstream(inputstream); //构造读取流 bos = new bufferedoutputstream(response.getoutputstream()); //构造输出流 byte [] buff = new byte [ 1024 ]; int bytesread; //每次读取缓存大小的流，写到输出流 while (- 1 != (bytesread = bis.read(buff, 0 , buff.length))) { bos.write(buff, 0 , bytesread); } response.flushbuffer(); //将所有的读取的流返回给客户端
} catch (filenotfoundexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } finally { try { if ( null != bis){ bis.close(); } if ( null != bos){ bos.close(); } } catch (ioexception e){ system.out.println( "下载文件失败," + "文件路径:" +filepath+e); logger.error( "文件下载失败!" , e); } } // 返回值要注意，要不然就出现下面这句错误！ //java+getoutputstream() has already been called for this response return null ; } |
以上所述是小编给大家介绍的java文件上传下载详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
原文链接：https://HdhCmsTestcnblogs测试数据/gczmn/p/9921479.html